Scroll compression device having a sealing device, and scroll compressor including such a scroll compression device

Abstract

The scroll compression device includes a first scroll element (11) having a first base plate (13) and a first spiral wrap (14); a second scroll element (12) having a second base plate (15) and a second spiral wrap (16), one of the first and second scroll elements (11, 12) being configured to perform an orbiting movement in relation to the other one of the first and second scroll elements, the first and second scroll elements (11, 12) intermeshing with each other and delimiting compression chambers (17); and a sealing device (28) arranged in an end face (19) of the first spiral wrap (14) and having a sealing surface configured to cooperate with the second base plate (15). The sealing device (28) is configured to allow fluid flow from an upstream compression chamber to a downstream compression chamber through the sealing surface when the pressure in the upstream compression chamber exceeds the pressure in the downstream compression chamber, and the sealing device (28) is configured to prevent fluid flow from a downstream compression chamber to an upstream compression chamber through the sealing surface when the pressure in the downstream compression chamber exceeds the pressure in the upstream compression chamber.

Claims

1. A scroll compression device including at least: a first scroll element having a first base plate and a first spiral wrap extending from the first base plate, a second scroll element having a second base plate and a second spiral wrap extending from the second base plate, at least one of the first and second scroll elements being configured to perform an orbiting movement in relation to the other one of the first and second scroll elements, the first and second scroll elements intermeshing with each other and delimiting compression chambers, a sealing device arranged in an end face of the first spiral wrap of the first scroll element and having a sealing surface configured to cooperate with the second base plate of the second scroll element, wherein the sealing device is configured to allow fluid flow from an upstream compression chamber to a downstream compression chamber through the sealing surface when the pressure in the upstream compression chamber exceeds the pressure in the downstream compression chamber, and the sealing device is configured to prevent fluid flow from a downstream compression chamber to an upstream compression chamber through the sealing surface when the pressure in the downstream compression chamber exceeds the pressure in the upstream compression chamber.

2. The scroll compression device according to claim 1, wherein the sealing surface is movable between a closing position in which the sealing surface sealingly cooperates with the second base plate and an opening position in which the sealing surface is distant from the second base plate, the sealing surface being configured to move towards the opening position when the pressure in the upstream compression chamber exceeds the pressure in the downstream compression chamber, and to move towards the closing position when the pressure in the downstream compression chamber exceeds the pressure in the upstream compression chamber.

3. The scroll compression device according to claim 2, wherein the sealing surface is elongated and extends along at least a part of the length of the first spiral wrap.

4. The scroll compression device according to claim 2, wherein the sealing surface has a rounded and convex cross section.

5. The scroll compression device according to claim 2, wherein the sealing device includes at least one reinforcement member.

6. The scroll compression device according to claim 1, wherein the sealing surface is elongated and extends along at least a part of the length of the first spiral wrap.

7. The scroll compression device according to claim 6, wherein the sealing surface extends along at least 30% of the length of the first spiral wrap.

8. The scroll compression device according to claim 7, wherein the sealing surface has a rounded and convex cross section.

9. The scroll compression device according to claim 6, wherein the sealing surface has a rounded and convex cross section.

10. The scroll compression device according to claim 6, wherein the sealing device includes at least one reinforcement member.

11. The scroll compression device according to claim 1, wherein the sealing surface has a rounded and convex cross section.

12. The scroll compression device according to claim 1, wherein the sealing device includes at least one reinforcement member.

13. The scroll compression device according to claim 1, wherein the end face of the first spiral wrap includes a receiving groove extending along at least a part of the length of the first spiral wrap, the sealing device being arranged in the receiving groove.

14. The scroll compression device according to claim 13, wherein the sealing device is slidably mounted in the receiving groove between a closing position in which the sealing surface sealingly cooperates with the second base plate and an opening position in which the sealing surface is distant from the second base plate.

15. The scroll compression device according to claim 1, wherein the sealing device includes a sealing lip having the sealing surface, the sealing lip being resiliently deformable between a closing position in which the sealing surface sealingly cooperates with the second base plate and an opening position in which the sealing lip is distant from the second base plate.

16. The scroll compression device according to claim 1, wherein the sealing device has a spiral shape.

17. The scroll compression device according to claim 1, wherein the sealing device is in one piece.

18. The scroll compression device according to claim 1, wherein the sealing device includes a plurality of sealing members each including a sealing surface configured to cooperate with the second base plate of the second scroll element.

19. The scroll compression device according to claim 1, further including a sealing device arranged in an end face of the second spiral wrap of the second scroll element and having a sealing surface configured to cooperate with the first base plate of the first scroll element, the sealing device, arranged in an end face of the second spiral wrap, is configured to allow fluid flow from an upstream compression chamber to a downstream compression chamber through the respective sealing surface when the pressure in the upstream compression chamber exceeds the pressure in the downstream compression chamber, and the sealing device, arranged in an end face of the second spiral wrap, is configured to prevent fluid flow from a downstream compression chamber to an upstream compression chamber through the respective sealing surface when the pressure in the downstream compression chamber exceeds the pressure in the upstream compression chamber.

20. A scroll compressor including a scroll compression device according to claim 1, and a drive shaft connected to the at least one of the first and second scroll elements and configured to drive the at least one of the first and second scroll elements in an orbiting movement.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The following detailed description of several embodiments of the invention is better understood when read in conjunction with the appended drawings being understood, however, that the invention is not limited to the specific embodiment disclosed.

(2) FIG. 1 is a partial and longitudinal section view of a scroll compressor including a scroll compression device according to a first embodiment of the invention.

(3) FIG. 2 is an enlarge view of the detail A of FIG. 1.

(4) FIG. 3 is an exploded perspective view of the scroll compression device of FIG. 1.

(5) FIG. 4 is a bottom view of a fixed scroll element of the scroll compression device of FIG. 1.

(6) FIG. 5 is an enlarge view of a detail of FIG. 4.

(7) FIG. 6 is a top view of an orbiting scroll element of the scroll compression device of FIG. 1.

(8) FIG. 7 is an enlarge view of a detail of FIG. 6.

(9) FIGS. 8 and 9 is an enlarge views of sealing devices of the scroll compression device of FIG. 1, showing the sealing devices in opening positions.

(10) FIG. 10 is a cross section view of the scroll compressor device of FIG. 1.

(11) FIG. 11 is a cross section view of a sealing device of a scroll compression device according to a second embodiment of the invention.

(12) FIG. 12 is a perspective view of a sealing device of a scroll compression device according to a third embodiment of the invention.

(13) FIGS. 13 and 14 are cross section views of a sealing device of a scroll compression device according to a fourth embodiment of the invention.

DETAILED DESCRIPTION

(14) FIG. 1 shows a scroll compressor 1 including a hermetic casing 2 having a generally cylindrical shell 3, a cap 4 fixed at an upper end of the generally cylindrical shell 3, and a base 5 fixed at a lower end of the generally cylindrical shell 3. The generally cylindrical shell 3 is provided with a suction inlet 6 configured to supply the scroll compressor 1 with refrigerant to be compressed, and the cap 4 is provided with a discharge outlet 7 configured to discharge compressed refrigerant.

(15) The scroll compressor 1 further includes a support member 8, also named crankcase, fixed to the hermetic casing 2, and a scroll compression device 9 disposed inside the hermetic casing 2 and supported by the support member 8. The scroll compression device 9 is configured to compress the refrigerant supplied through the suction inlet 6. The scroll compression device 9 includes a fixed scroll element 11 and an orbiting scroll element 12.

(16) The fixed scroll element 11 includes a base plate 13 and a spiral wrap 14 projecting from the base plate 13 towards the orbiting scroll element 12. The spiral wrap 14 includes an inner face 14.1 directed towards a center portion of the base plate 13, and an outer face 14.2 opposite to the inner face 14.1 and directed towards the outer periphery of the base plate 13.

(17) The orbiting scroll element 12 includes a base plate 15 slidably mounted on the support member 8, and a spiral wrap 16 projecting from the base plate 15 towards the fixed scroll element 11. The spiral wrap 16 includes an inner face 16.1 directed towards a center portion of the base plate 15, and an outer face 16.2 opposite to the inner face 16.1 and directed towards the outer periphery of the base plate 15.

(18) The spiral wrap 16 of the orbiting scroll element 12 meshes with the spiral wrap 14 of the fixed scroll element 11 to form a plurality of compression chambers 17 (see also numerical references 17.1 to 17.4 on FIG. 2) between them. Each of the compression chambers 17 has a variable compression volume which decreases from the outside towards the inside, i.e. inwardly towards a center portion of the fixed and orbiting scroll elements 11, 12, when the orbiting scroll element 12 is driven to orbit relative to the fixed scroll element 11. Each compression chambers 17 is inwardly delimited by the outer face of the spiral warp 14 or of the spiral wrap 16, and is outwardly delimited by the inner face of the spiral warp 14 or of the spiral wrap 16.

(19) The fixed scroll element 11 includes a receiving groove 18 provided on the end face 19, also named tip face, of the spiral wrap 14 and extending along a part of the length of the spiral wrap 14. According to the embodiment shown on FIGS. 1 to 10, the receiving groove 18 extends from an outer point adjacent to an outer end portion of the spiral wrap 14 to an inner point situated near an inner end portion of the spiral wrap 14. The receiving groove 18 may extend along at least 30%, and for example at least 60% or at least 70%, of the length of the spiral wrap 14.

(20) The orbiting scroll element 12 also includes a receiving groove 21 provided on the end face 22 of the spiral wrap 16 and extending along a part of the length of the spiral wrap 16. According to the embodiment shown on FIGS. 1 to 10, the receiving groove 21 extends from an outer point adjacent to an outer end portion of the spiral wrap 16 to an inner point situated near an inner end portion of the spiral wrap 16. The receiving groove 21 may extend along at least 70%, and for example at least 80%, of the length of the spiral wrap 16.

(21) The scroll compression device 9 further includes a discharge port 23 provided at a central portion of the base plate 13 of the fixed scroll element 11, and configured for discharging compressed refrigerant from the compression chambers 17 into a high pressure volume 24 defined by the cap 4. Particularly, the compression volume of each compression chamber 17 decreases towards the discharge port 23.

(22) Furthermore the scroll compressor 1 includes a drive shaft 25 adapted for driving the orbiting scroll element 12 in orbital movements relative to the fixed scroll element 11. Particularly the drive shaft 25 has, at its upper end, an eccentric driving portion 26 received in a cylindrical hub 27 protruding from the lower face of the orbiting scroll element 12.

(23) The scroll compressor 1 also includes two sealing devices 28, 29 respectively arranged in the receiving grooves 18, 21, and extending respectively substantially along the entire length of the respective receiving groove 18, 21. As better shown on FIG. 3, each sealing device 28, 29 is made in one piece and has a spiral shape. Each sealing device 28, 29 could be made for example in rubber or in elastomeric material. The sealing devices 28, 29 are particularly configured to axially seal the compressions chambers 17 respectively between the tip face of the spiral wrap of the respective scroll element and the base plate of the other scroll element.

(24) As better shown on FIGS. 2, 5 and 7, each sealing devices 28, 29 includes a support portion 31, 32 having a spiral shape and being firmly and sealingly fitted in the respective receiving groove 18, 21. Each sealing device 28, 29 further includes a sealing lip 33, 34 having a spiral shape and extending from and along the whole length of the respective support portion 31, 32. Each sealing lip 33, 34 has an elongated sealing surface 35, 36. According to the embodiment shown on FIGS. 1 to 10, each sealing surface 35, 36 has a rounded and convex cross section. However, each sealing surface 35, 36 may have another shape, and may for example have a sharp edge.

(25) The sealing lip 33 of the sealing device 28 is resiliently deformable between a closing position (see FIG. 2) in which the sealing surface 35 sealingly cooperates with the base plate 15 of the orbiting scroll element 12 (i.e. provides a resilient sealing pressure against the base plate 15 of the orbiting scroll element 12), and an opening position (see FIG. 9) in which the sealing lip 33 is distant from the base plate 15. Similarly, the sealing lip 34 of the sealing device 29 is resiliently deformable between a closing position (see FIG. 2) in which the sealing surface 36 sealingly cooperates with the base plate 13 of the fixed scroll element 11 (i.e. provides a resilient sealing pressure against the base plate 13 of the fixed scroll element 11), and an opening position (see FIG. 8) in which the sealing lip 34 is distant from the base plate 13.

(26) The sealing lip 33 is configured to be resiliently deformed towards its opening position when the pressure in a compression chamber (for example compression chamber 17.1 on FIG. 2) located upstream the sealing lip 33 and adjacent to the sealing lip 33 (i.e. in a compression chamber 17 inwardly defined by the outer face 14.2 of the spiral warp 14) exceeds the pressure in a compression chamber (for example compression chamber 17.2 on FIG. 2) located downstream the sealing lip 33 and adjacent to the sealing lip 33 (i.e. in a compression chamber 17 outwardly defined by the inner face 14.1 of the spiral warp 14), and to be resiliently deformed towards the closing position when the pressure in a compression chamber (for example compression chamber 17.4 on FIG. 2) located downstream the sealing lip 33 and adjacent to the sealing lip 33 exceeds the pressure in a compression chamber (for example compression chamber 17.3 on FIG. 2) located upstream the sealing lip 33 and adjacent to the sealing lip 33.

(27) However, as according to the embodiment shown on FIGS. 1 to 10, the sealing lip 33 extends along substantially the whole length of the spiral wrap 14, the sealing lip 33 simultaneously partially delimits several compression chambers 17. Therefore, for example, a first portion of the sealing lip 33 could be resiliently deformed towards the opening position while a second portion of the sealing lip 33 could be resiliently deformed towards the closing position.

(28) Similarly the sealing lip 34 is configured to be resiliently deformed towards its opening position when the pressure in a compression chamber (for example compression chamber 17.2 on FIG. 2) located upstream the sealing lip 34 and adjacent to the sealing lip 34 (i.e. in a compression chamber 17 inwardly defined by the outer face 16.2 of the spiral warp 16) exceeds the pressure in a compression chamber (for example compression chamber 17.3 on FIG. 2) located downstream the sealing lip 34 and adjacent to the sealing lip 34 (i.e. in a compression chamber 17 outwardly defined by the inner face 16.1 of the spiral warp 16), and to be resiliently deformed towards the closing position when the pressure in a compression chamber (for example compression chamber 17.3 on FIG. 2) located downstream the sealing lip 34 and adjacent to the sealing lip 34 exceeds the pressure in a compression chamber (for example compression chamber 17.2 on FIG. 2) located upstream the sealing lip 34 and adjacent to the sealing lip 34.

(29) As according to the embodiment shown on FIGS. 1 to 10, the sealing lip 34 extends along substantially the whole length of the spiral wrap 16, the sealing lip 34 simultaneously partially delimits several compression chambers 17. Therefore, for example, a first portion of the sealing lip 34 could be resiliently deformed towards the opening position while a second portion of the sealing lip 34 could be resiliently deformed towards the closing position.

(30) Consequently, the sealing device 28 is configured to allow fluid flow from an upstream compression chamber to a downstream compression chamber through the sealing surface 35 (and thus along a flow direction extending inwardly, i.e. towards the center portion of the fixed and orbiting scroll elements 11, 12) when the pressure in the upstream compression chamber exceeds the pressure in the downstream compression chamber, and to prevent fluid flow from a downstream compression chamber to an upstream compression chamber through the sealing surface 35 when the pressure in the downstream compression chamber exceeds the pressure in the upstream compression chamber.

(31) Similarly the sealing device 29 is configured to allow fluid flow from an upstream compression chamber to a downstream compression chamber through the sealing surface 36 (and thus along a flow direction extending inwardly, i.e. towards the center portion of the fixed and orbiting scroll elements 11, 12) when the pressure in the upstream compression chamber exceeds the pressure in the downstream compression chamber, and to prevent fluid flow from a downstream compression chamber to an upstream compression chamber through the sealing surface 36 when the pressure in the downstream compression chamber exceeds the pressure in the upstream compression chamber.

(32) Such a configuration of the sealing devices 28, 29 ensures a leakage of the refrigerant from an upstream compression chamber to a downstream compression chamber when the pressure in the upstream compression chamber exceeds the pressure in the downstream compression chamber, and thus allows, on the one hand, to adjust the compression rate, i.e. the pressure ratio, of the scroll compression device and, on the other hand, to avoid an overcompression of the refrigerant, without adjusting the displacement of the scroll compression device.

(33) FIG. 11 represents a sealing device 41 of a scroll compression device according to a second embodiment of the invention. As the sealing devices 28, 29, the sealing device 41 includes a support portion 42 and a sealing lip 43 having a sealing surface 44. However the sealing device 41 differs from the sealing devices 28, 29 in that it includes a reinforcement member 45 which may extend along a part of the length or the whole length of the sealing lip 43. The reinforcement member 45 is advantageously metallic, and could be made for example in steel.

(34) FIG. 12 represents a sealing device 51 of a scroll compression device according to a third embodiment of the invention. The sealing device 51 differs from the sealing devices 28, 29 essentially in that it includes a plurality of sealing members 52, each sealing member 52 including a support portion 53 and a sealing lip 54 having a sealing surface 55. Advantageously, the sealing members 52 are arranged in an abutting manner in the respective receiving groove. For example, the sealing lips 54 of each pair of adjacent sealing members 52 may overlap.

(35) FIGS. 13 and 14 represent a sealing device 61 of a scroll compression device according to a fourth embodiment of the invention. As the sealing devices 28, 29, the sealing device 61 includes a sealing surface 62. However the sealing device 61 differs from the sealing devices 28, 29 essentially in that it is slidably mounted in the respective receiving groove 63 between a closing position (see FIG. 13) in which the sealing surface 62 sealingly cooperates with the respective base plate and an opening position (see FIG. 14) in which the sealing surface 62 is distant from the respective base plate.

(36) According to said fourth embodiment of the invention, the sealing device 61 is inclined with respect to the orbiting axis of the orbiting scroll element 12, and includes an outer face 64 configured to slide on a first side wall 65 of the respective receiving groove 63, and an inner face 66 opposite to the outer face 64 and facing a second side wall 67 of the receiving groove 63. The outer face 64 of the sealing device 61 is directed towards an upstream compression chamber 17, while the inner side face 66 of the sealing device 61 is directed towards a downstream compression chamber 17. As better shown on FIG. 14, the sealing device 61 and the receiving groove 63 define a clearance gap 69.

(37) Advantageously, the outer face 66 of the sealing device 61 includes a substantially flat surface 68 extending parallely to the orbiting axis of the orbiting scroll element 12, and configured to be located outside the respective receiving groove 63 when the respective sealing surface 62 is in the closing position.

(38) According to said fourth embodiment of the invention, the sealing device 61 is configured to move towards the opening position when the pressure in a compression chamber located upstream the sealing device 61 and adjacent to the sealing device 61 (i.e. in a compression chamber 17 inwardly defined by the outer face of the spiral warp 14 or of the spiral wrap 16) exceeds the pressure in a compression chamber located downstream the sealing device 61 and adjacent to the sealing device 61 (i.e. in a compression chamber 17 outwardly defined by the inner face of the spiral warp 14 or of the spiral wrap 16), and to move towards the closing position when the pressure in the downstream compression chamber exceeds the pressure in the upstream compression chamber.

(39) Of course, the invention is not restricted to the embodiments described above by way of non-limiting examples, but on the contrary it encompasses all embodiments thereof.

(40) While the present disclosure has been illustrated and described with respect to a particular embodiment thereof, it should be appreciated by those of ordinary skill in the art that various modifications to this disclosure may be made without departing from the spirit and scope of the present disclosure.